There are five kinds of solutions. Gas in liquid is one of them, therefore, which of the given examples is one of the solutions?
A. Air and water B. Cola or Soft drink C. Oxygen and salt D. Rocks and solvent
The correct answer and explanation is:
The correct answer is B. Cola or Soft drink.
Explanation:
A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). There are five types of solutions, which are categorized based on the phases of the solute and solvent. These include:
- Gas in Gas: For example, air, where gases like oxygen, nitrogen, and other gases are mixed.
- Liquid in Liquid: An example of this is ethanol in water, where the two liquids dissolve in each other.
- Solid in Liquid: An example is salt or sugar dissolved in water.
- Gas in Liquid: This type involves gases dissolved in liquids, like oxygen in water.
- Solid in Solid: This is seen in alloys, such as bronze or steel, where different metals dissolve into each other.
Why Cola or Soft Drink is the Correct Answer:
Cola or soft drinks are examples of gas in liquid solutions. In this case, carbon dioxide (CO2) is dissolved in the liquid (usually water along with other ingredients). When you open a can of cola, the CO2 gas is released, which is why the drink “fizzes.” The carbonation, which is CO2 gas dissolved in water, forms a gas in liquid solution.
Why the Other Choices are Incorrect:
- A. Air and water: While air can contain gases dissolved in water, air itself is a gas, and this does not directly fit into the categories of solutions, as air is not a solution itself.
- C. Oxygen and salt: This is not a typical solution. Oxygen is a gas, and salt (sodium chloride) is a solid. Salt dissolves in water to form a solution, but oxygen would not dissolve easily in salt.
- D. Rocks and solvent: Rocks are solids, and solvents are typically liquids. This is not a solution because rocks do not dissolve in solvents like a solute dissolves in a solvent.
Thus, the best choice that describes a solution is B. Cola or Soft drink, where CO2 gas is dissolved in the liquid.